using System;

class nullValueType
{
    static void Main()
    {
		int? nullIntValue=null;
		Console.WriteLine("Printing null int with value null and function GetValueOrDefault(): "+nullIntValue.GetValueOrDefault());
		Console.WriteLine("Printing null int with value null+5:"+(nullIntValue+5));
		nullIntValue=55;
		Console.WriteLine("Printing null int with value: "+nullIntValue);
		double? nullDoubleValue=null;
		Console.WriteLine("Printing null double with value null and function GetValueOrDefault(): "+nullDoubleValue.GetValueOrDefault());
		Console.WriteLine("Printing null double with value null+5:"+(nullDoubleValue+5.5));
		nullDoubleValue=56.3d;
		Console.WriteLine("Printing null double with value: "+nullDoubleValue);
    }
}
